What is design development?

Design development is the stage that turns a promising concept into a proposal ready for planning. We refine the chosen option, resolve the questions concept design left open, coordinate the architecture with emerging structural and services strategies and bring the scheme to a level of resolution that supports a confident submission.

Where Architectural Design sits in the RIBA process

0. Strategic Definition

1. Preparation & Briefing

2. Concept Design

7. Use

3. Spatial Coordination

6. Handover

5. Manufacturing & Construction

4. Technical Design

2. Concept Design

The design team explores options and massing, sets a sustainability approach, and prepares an order-of-cost estimate. Early conversations with planners may begin. By the end of this stage there's a preferred concept that meets the brief and budget.

3. Spatial Coordination

Design moves from ideas to a coordinated layout. Architecture, structure and building services are aligned so rooms, risers, fire strategy and servicing all work together. The result is a frozen arrangement with updated cost and risks understood.

Look at the whole process

Why does this stage de-risk a project?

Getting this stage right de-risks everything after it. A well-developed scheme attracts fewer planning objections, fewer surprises at technical stage and fewer costs from late change, because the difficult questions were answered while change was still cheap.

Refinement of chosen design options

We refine the preferred design option, resolving questions raised at concept stage.

Coordination of form and elements

We coordinate architectural elements and building form, ensuring consistency across the proposal.

Integration of structural and services input

We integrate structural and services requirements so the design progresses on a sound technical basis.

What gets resolved during design development?

The questions concept design deliberately left open: the materials and appearance of the building, how the structure and services strategies fit the architecture, how the scheme meets policy expectations in detail and where the cost plan needs the design to respond. By the end, the proposal is resolved enough to defend in public.

A project we have worked on

East Norfolk College (Various Areas)

Norfolk

Education
Masterplanning & Phased Works
College

Three-year campus programme: courtyard infills creating teaching space, auditorium upgrades, a two-storey CDT block, and a nursery and animal centre. Planning secured in phases, with project management alongside the Principal Contractor.

View project

FAQs

What happens during design development?

+

The preferred concept is refined in plan, form and appearance, structural and services strategies are integrated, materials are proposed and the scheme is tested against planning policy, cost and the brief until it is submission-ready.

How developed should a design be before planning submission?

+

Enough to be credible and assessable: resolved layouts, accurate form and massing, elevations with material intent and answers to the site's known constraints. Detail beyond that is refined after consent.

How do engineering inputs shape this stage?

+

Structural grids, plant space and service routes all affect the architecture. Integrating them now means the consented scheme is technically deliverable, not a picture that later needs redrawing.

What if the developed design starts drifting from budget?

+

Cost is tracked through the stage with the cost consultant where one is appointed. If pressure emerges, options are developed early, while the design can still adapt without unpicking a consent.

Can you develop a concept produced by someone else?

+

Yes, after a review of the existing design and its assumptions. We take over schemes at this stage regularly, strengthening them where the concept left questions open.

What do we have at the end of the stage?

+

A coordinated, planning-ready design package: plans, elevations, sections, massing and supporting design narrative, agreed with you and aligned with the planning strategy.

What our clients say

From schools to homeowners, we work closely with every client to deliver thoughtful, lasting architecture here’s what they’ve said about working with us.

Sarah Mitchell
Headteacher, Hollowbrook primary

AEC understood exactly what our school needed a space that was calm, practical, and inspiring for students and teachers alike. The whole process felt collaborative from day one, and the end result has had a real impact on daily school life.

James Carter
Private homeowner, Cambridge

Working with AEC was seamless. They listened carefully, challenged our thinking in the right ways, and delivered a design that just works — light, functional, and surprisingly cost-efficient. We couldn’t be happier with the result.

Ravi Patel
Director, Ashore housing development

AEC brought clarity and creativity to a complex residential scheme. Their technical knowledge and attention to detail kept the project on track and their team were genuinely great to work with.

Sarah Mitchell
Headteacher, Hollowbrook primary

AEC understood exactly what our school needed a space that was calm, practical, and inspiring for students and teachers alike. The whole process felt collaborative from day one, and the end result has had a real impact on daily school life.

James Carter
Private homeowner, Cambridge

Working with AEC was seamless. They listened carefully, challenged our thinking in the right ways, and delivered a design that just works — light, functional, and surprisingly cost-efficient. We couldn’t be happier with the result.

Ravi Patel
Director, Ashore housing development

AEC brought clarity and creativity to a complex residential scheme. Their technical knowledge and attention to detail kept the project on track and their team were genuinely great to work with.

Sarah Mitchell
Headteacher, Hollowbrook primary

AEC understood exactly what our school needed a space that was calm, practical, and inspiring for students and teachers alike. The whole process felt collaborative from day one, and the end result has had a real impact on daily school life.

James Carter
Private homeowner, Cambridge

Working with AEC was seamless. They listened carefully, challenged our thinking in the right ways, and delivered a design that just works — light, functional, and surprisingly cost-efficient. We couldn’t be happier with the result.

Ravi Patel
Director, Ashore housing development

AEC brought clarity and creativity to a complex residential scheme. Their technical knowledge and attention to detail kept the project on track and their team were genuinely great to work with.

Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.

Got a project in mind?
Let’s bring it to life

We’re always up for a new challenge. Whether it’s a home, a school, or something completely unique.